Teledyne LXT-280 - Manual (Page 11)

Dissolved Oxygen Transmitter Introduction
Teledyne Analytical Instruments 1
Introduction
1.1 Overview
Teledyne’s Model LXT-280 Transmitter is a robust and versatile
instrument for measurement and process control of dissolved oxygen.
This instrument is Factory Mutual Approved as intrinsically safe and
explosion proof for use in Class I, II, and III Divisions 1 Groups A
through G hazardous areas. The Model LXT-280 transmitters provide
solutions to a variety of liquid analytic applications involving hazardous
areas. The LXT-280 accepts input from a variety of sensors for specific
process measurements such as:
• Dissolved Oxygen (DO)
• pH
• Resistivity ( or conductivity)
• Oxidation-Reduction Potential (ORP)
• Specific Ion
The standard instrument is powered from an external 24 VDC
source and is equipped with a 4-20mA current output transmitted on the
same 24 VDC wiring. The power supply and electronics are remote from
each other and for FM approval, should be connected through an
intrinsic safety barrier. Separate compartments in the stainless steel
explosion proof housing keep the wiring and the electronics separate and
sealed from each other. This prevents the sensitive electronics from
being exposed to hostile environments.
The LXT-280 is housed in a Factory Mutual Approved explosion
proof stainless steel NEMA-7C housing. The operator interacts with the
instrument via magnetic switches located on the front panel behind a
removable cover. The magnetic switches can be activated without
having to open the cover.
This transmitter is capable of measuring dissolved oxygen in ppm
or in the percent oxygen range.